Mylan sits next to 4 phonetic neighbors — Milan, Dylan, and Nolan are the closest matches by sound. Most share Mylan's Slavic cluster, so the rhythm and vowel shape carry across the list.
You searched for names like
"dear, gracious, beloved"
"lead metal, dense and enduring"
"hazel valley dweller"
"the fifth"
"supreme ruler"
"modern blend: bright house, highest point"
"nonconformist, free spirit"
"from Clare (Suffolk)"
"dark one, little dark one"
"son of the brave one"
"sad, melancholy (folk etymology)"
"divine, of the god of wine"
"brave as a wild boar"
"lion strength"
"God is salvation"
"row of trees by the wood"
"creative modern variant of Ashton/Cashton"
"young wolf"
"son of Carr, son of the marsh dweller"
"victory of the people"
"a large inland body of water"
Similar sound: These names share phonetic patterns with Mylan — similar vowel sounds, consonant clusters, or rhythm.
Shared roots: Several names on this list have Old Slavic mil origins, giving them the same cultural heritage as Mylan.
Rhythm: Mylan is a 2-syllable name. Names with the same syllable count tend to feel interchangeable when you're narrowing your list.